I kind of want a Dark Knight Returns-esque Joker in his appearance this time around. Burton/Nicholson was very overtly freakish, very Burton, and Nolan/Ledger was young and punk rock and anarchist. Doing something unsettling like the TDKR Joker would be awesome. It's almost like David Bowie when his face is neutral, but then when he gets a smile on his face or starts laughing, all Hell breaks loose.